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Automatic contrast enhancement system

A technology of automatic contrast and human visual system, applied in the field of automatic contrast enhancement system, can solve the problem of low overall complexity of the algorithm

Inactive Publication Date: 2016-04-20
NCKU RES & DEV FOUND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above, the object of the present invention is to provide an automatic contrast enhancement system. The technical problem to be solved is to make it consider the human visual sensitivity to establish a histogram, and automatically determine the enhancement level related to the device according to its distribution. After contrast enhancement The resulting saturation degradation can be compensated by saturation enhancement, and can improve local saturation of the image without amplification of chroma noise. Furthermore, the overall complexity of the algorithm is very low, suitable for hardware implementation and real-time application

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Embodiment Construction

[0043] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, characteristics and effects of the automatic contrast enhancement system proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. , as detailed below.

[0044] figure 1 is a block diagram illustrating an automated contrast enhancement system 100 according to an embodiment of the present invention. The automatic contrast enhancement system 100 may be implemented using a processor (eg, a digital image processor), a circuit, or a combination thereof.

[0045] The automatic contrast enhancement system 100 includes a local difference (LD) histogram unit 11 based on the human visual system (HVS), which receives input pixels of an input image. According to one of the features of this embodiment, the luminance of the Hue-...

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Abstract

The invention discloses an automatic contrast enhancement system. The automatic contrast enhancement system comprises a local difference histogram unit based on a human visual sense system and used to build a local difference histogram with respect to intensity values; a histogram classifier, which can be used for classification of histograms of input images according to distribution characteristics; and a histogram equalization unit, which is used to process the input images according to the result of the local difference histogram unit based on the human visual sense system and the enhanced level determined by the histogram classifier.

Description

technical field [0001] The invention relates to an automatic contrast enhancement system, in particular to an automatic contrast enhancement system based on the human visual system (HVS) which can suppress side effects. Background technique [0002] Image enhancement is often used to improve low-contrast images or images captured under non-ideal lighting conditions. Traditional contrast enhancement algorithms often cause over-enhancement, making images look unnatural and noisy. [0003] Histogram Enhancement (HE) is one of the most commonly used methods to improve contrast enhancement. With histogram enhancement, the intensity of the image can be distributed more evenly to achieve better contrast. The overall complexity of the histogram enhancement algorithm is lower than other methods. However, histogram enhancement is prone to over-enhancement, noise amplification, loss of detail, or unnatural-looking images. [0004] Furthermore, the human eye cannot distinguish inten...

Claims

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Application Information

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IPC IPC(8): H04N5/208G06T5/00G06T5/40
Inventor 谢明得杨得炜张芸甄王宗仁
Owner NCKU RES & DEV FOUND